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Code:
/*

    Object duplication prevention system.

*/

prototypes to put in mud.h:

long make_obj_guid(void);

OBJ_DATA *dupecheck( long id );

char dupelist[MSL];

long make_obj_guid(void)

{

    long val;

    val = (current_time <= sysdata.last_obj_guid) ? sysdata.last_obj_guid + 1 : current_time;

    sysdata.last_obj_guid = val;

    save_sysdata( sysdata );

    return val;

}

OBJ_DATA *dupecheck( long id )

{

  OBJ_DATA *obj;

  if (!id)

   return NULL;

  for (obj = first_object; obj; obj = obj->next)

    if (obj->guid == id)

      return obj; // Found one.

  return NULL;

}

in mud.h 

to system_data add:

    long int last_obj_guid;

to obj_data add:

    long        guid;    // tracks dupes

in save_sysdata add:

    fprintf( fp, "Obj_GUID      %ld\n", sys.last_obj_guid             );

in fread_sysdata add:

        KEY( "Obj_GUID",       sys->last_obj_guid, fread_number( fp ) );

in db.c before:

in create_object

    return obj;

add

    obj->guid = make_obj_guid();

save.c 

in load_char_obj:

before:

    for ( ; ; )

add:

        *dupelist = 0;

and between:

    loading_char = NULL;

    return found;

add:

    if (*dupelist != 0)

    {

      bug( "Duping detected: %s, duped: %s, stripping", ch ? ch->name : "Unknown", dupelist );

    }

in fwrite_obj:

after:

    fprintf( fp, "Vnum         %d\n",    obj->pIndexData->vnum         );

add:

    fprintf( fp, "GUID %ld\n", obj->guid );

in fread_obj:

after

    CREATE( obj, OBJ_DATA, 1 );

    obj->count        = 1;

add

    obj->guid = 0;

Then add

    case 'G':

        if ( !strcmp( word, "GUID" ) )

        {

                OBJ_DATA *dupe=NULL;

        fMatch = TRUE;

                long guid;

                guid = fread_number(fp); // change GUID

                if (guid)

                  obj->guid = guid;

                else

                  break; // New.

                if ( (dupe = dupecheck( obj->guid )) != NULL) // Critical! 

                {

                  sprintf( dupelist, "%s%d ", dupelist, vnum );

                  fVnum = FALSE; // treat as an Illegal vnum, remove from character when done.

                }

        break;

        }

            break;

in clans.c

in load_clan_file

between:

        found = TRUE;

        for ( ; ; )

add:

            *dupelist = 0;

between:

        }

        fclose( fp );

Add:

            bug( "Duping detected: %s, had the following in their hall: %s, stripping", clan->name, dupelist );

If you're using Erwins board system you can replace the bug messages with:

    if (*dupelist != 0)

    {

      logs( "Duping detected: %s, duped: %s, stripping", ch ? ch->name : "Unknown", dupelist );

    }

with:

    if (*dupelist != 0)

    {

      char buf[MAX_INPUT_LENGTH];

      sprintf( buf, "Duping detected: %s, duped: %s, stripping", ch ? ch->name : "Unknown", dupelist );

      make_note ( "Immortals", "The MUD", "imm", "Duping Report", 60, wordwrap( buf, 78 ) );

      if (ch && !IS_STAFF(ch) && !IS_NPC(ch))

      {

        char to[MAX_INPUT_LENGTH];

        sprintf( buf, "You have been caught duplicating items by the MUD. These duplicate items have been removed from your possession and will not be refunded. Signs of this having been deliberate may incur further punishment. You are encouraged to report how this happened if you know what you did to cause it.");

        sprintf( to, "%s imm", ch->name );

        make_note ( "Personal", "The MUD", to, "Your Warning", 60, wordwrap( buf, 78 ) );

      }

    }

or similar

You'll need to add to mud.h :

char *wordwrap( char *txt, sh_int wrap );

void make_note (const char* board_name, char *sender, char *to, char *subject, const int expire_days, char *text);

If you're using lockers or a similar system you'll want to put similar dupecheck initializations and reportings immediately before/after the loads.